Cut out four rectangles in coloured card to the dimensions of the milk carton. Stick the card pieces onto the sides of the carton with double-sided tape.
Cut a rectangle out of brown paper and fold down the middle. Draw on tiles facing away from the fold and then stick onto the top of the carton with double-sided tape.
Cut windows out of paper and glue them on. Cut a rectangle out of another piece of coloured card and fold over one of the ends. Stick down the fold with tape to create your door